Pressure-governor.



s. A. WORCESTER.

PRESSURE GOVERNOR. APPLIOATION IILED AUG.27,1908.

' Patented Aug. 3, 1909.

attoznego SAMUEL A. WORCESTER, OF VICTOR, COLORADO.

rnEssuna-oo manon.

Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed August 27, 1908. Serialflo. 450,618.

To all whom it may concern:

Be it known that I, SAMUEL A. Woncns- TER, a citizen of the United States, residing .1 for Air or Gas Compressors, Pumps, or the Like; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in pressure governors for air or gas compressors, pumps or other like devices. Governors of this type now used for regulating the operation of air con'lpressors or pumps, are usually of the piston or plunger type and are loaded with heavy weights or springs which are necessary for opposing the force of air pressure from the main. These governors are objectionable, however, in that a variation of several pounds in pressure is usually necessary for operating them and further, because they are irregular or intermittent in their action allowing a large variation'in the speed of the machine. These objections I overcome, however, by providmg a pressure governor which is extremely sensitive and Wlll operate with a variation of but a few ounces in the mainand thus proportionately increase or decrease the speed of the air compressor or other like device to which it is applied.

With this and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be more fully described and particularly pointed out in the appended claims. 1

In theaccompanying drawings, Figure 1 is aside elevation illustrating the application of my improved pressure governor to the well known Corliss releasing valve gear; Fig. 2- is a sectional view of the governor and associated parts; and Fig. 3 is a diagrammatical view illustrating the application of the invention to a steam throttle valve.

" qt 1e frame work of the valve gear, a piston 4 being arranged in said cylinder 3 and provided with the usual upright stem- 5 which extends through the upper end of the c linder and is connected with one end 0 the float lever 6 which is pivoted intermediate its ends, as at 7, to lever 6 which in turn is pivoted at its inner end, as at 6 to the inner end of a horizontal arm or bracket 6" projpcting from one side of the usual support 6 these connections it will be seen that w on piston stem 5 is raised by pressure ex- UNITED sTATEs PATENT OFFICE.

erted upon piston 4, the free end of lever 6' V will be caused to swing upward and operate the cut-off mechanism. A valve casing 7 is arranged near the piston. A valve 8is formed at the lower end of a stem 9 mounted to slide vertically withinsaid casing and is adapted to close the passage thercthrough. A yoke 10 straddles the valve casing, its lower end being connected by an adjusting spring 11, and a screw 12, wit 1 a lateral arm 13 projecting from a fluid supply pipe 14 leading from the main pressure supply to the valve casing. A screw 15 screws through the cross piece 16 of the yoke 10 against the upper end of the stem 9 the urpose of W1lCl1.Wil l be presently disclose(. A fluid conducting pipe 17 provided with an exhaust 'ipe 18 effects communication between the va ve casin andcylinder 3. A collar 19 is held upon t e pi e 17 by an adjusting screw 20, said collar aving a depending arm or bracket 2] to the lower end of which is adjustably pivoted a horizontally disposed operating member 22 one end of which as 23, is attached to the lower end of the yoke 10 and the opposite end of'which, as 24, is attached to one end of the coil spring 28,'the

upper end of the latter being attached to the sure from the main or pressure tank is led to the casing 7 by the pipe 14. When the compressor is started, it runs at the speed given it by the throttle or speed governor until the air pressure rises to the limit to which the adjusting spring 11 is set. As soon as the pressure, however, exceeds this limit, the valve 8 is raised slightly and the pressure fluid is admitted beneath the piston 4 as will be evident and causes the p'istonto rise in the cylinder 3, the result of which is that the upward movement ofthe yoke is-increased,

and for-this reason the governorv is not allowed to make its full stroke until a greater rise in pressure occurs to cause the piston 4 to rise still farther in the*cylinder 3. Under ordinary running conditions, therefore, the piston 4 will be sustained in midvosition with the air pressure from the main etween high and low limits.

I In practice, assuming the range of pressure a owable on the main to be two pounds per square inch or from ninety-'nineto one undred and one pounds, there is then available for operating the pressure governor, a pressure variation of nearly one-hundred pounds, while the main pressure. varies by two pounds. This feature of large pressure variation makes the pressure governor sosensitive as to respond-to a variation of but erate heavy cut-ofl valve gear with ease. 1

It ,is obvious that a stationary' lunger with a movable cylinder or any other 'ke'device may be substituted for regulatingthe cut-off mechanism. Also, electric compressors may be regulated by connecting this governor to suitable'switc es. From the foregoing' description, taken in connection with the accompanying drawings, the construction and operation of the 4oinvention will be readily understood without uiring a more extended explanation.

arious changes in the form, proportion "andthe minor details of construction may be resorted to without departing from the I: 46. principle or sacrificing any of the advantages offthis invention as defined-in the'ap pended" claims.

. Having thus described and ascertained the nature of my invention, what I claim, as

ing lever or link pivoted beneath the valve. casing and attached at its pivoted end to the' a few ounces in pressure at the main and opgage the valve stein, a resilient element tend-- mg to oppose movement of the valve when ent, 1s:

1. In a pressure governor, a cylinder, a piston movable therein, connections between the piston and a s eed reducing gear, a valve casing, a 'vertica y movable valve to close the casing against the passage of a pressure fluid therethrough, a fluid supply pipe leading to the casing, a second pipe between said casing and cylinder, a yoke to stradlde the valve casing, a screw screwing through the yoke against the valve stem and an adjustable spring tending to oppose vertical movement of said valve when acted upon by a pressure fluid.

2. In a ]pressure governor, a casing, a piston mova le therein, connections'betwecn said iston and a speed reducin valve gear, a va ve casing, a valvemovab e therein, a fluid sup ly pipe leading to the casing, a yoke to stra (Ie the valve casing and to engage the valve stem, a resilient element tending to oppose movement of the valve when acted' upon by a pressure fluid, adjustable means for said resilient element, an operatnew and desire to secure by .Letters-Pat- 50 yoke and a resilient element between .the free end of said link and said piston.

3. In'a pressure governor, a cylinder, 0.. piston movable therein, connections between said piston and a speed reducing gear, a valve casing, a valve movable thereln a fluid supply ipe leading. to the casing, a ,yoke to strad Ie the valve casing and to en acted upon by a pressure'fluid, an operatin pivoted beneath the valve casing anc connected with the yoke, and a resilient ele. ment between the free end of the'link and said piston. I In testimony whereof I have hereunto set my'lhand in presence of two subscribing witnesses.

1 SAMUEL A. WORCESTER.- Witnesses:

FRANK J. SGHRIVER, JOSEPH E. HARDY. i 

